1. University of Birmingham; Institute of Applied Health Research; Edgbaston Campus Birmingham UK B15 2TT
2. University Hospitals Birmingham NHS Foundation Trust and University of Birmingham; NIHR Birmingham Biomedical Research Centre; Birmingham UK
3. The University of Nottingham; c/o Cochrane Skin Group; Nottingham UK
4. Churchill Hospital; Department of Dermatology; Old Road Headington Oxford UK OX3 7LE
5. Whiston Hospital; Department of Plastic and Reconstructive Surgery; Warrington Road Liverpool UK L35 5DR
6. University of Nottingham; Centre of Evidence Based Dermatology; Queen's Medical Centre Derby Road Nottingham UK NG7 2UH